heroine vs paladin

heroine

noun
  • A female hero. 

  • A female lead character. 

paladin

noun
  • A heroic champion, especially a knight. 

  • Any of the twelve Companions of the court of Emperor Charlemagne. 

  • A defender or advocate of a noble cause. 

How often have the words heroine and paladin occurred in a corpus of books? (source: Google Ngram Viewer )